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DXT1 supports 8-bit alpha

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This commit is contained in:
Andrew Murray 2025-05-06 20:37:34 +10:00
parent 320dff834d
commit 3f09f9b5cc
1 changed files with 7 additions and 4 deletions
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11
src/PIL/VtfImagePlugin.py
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@ -15,7 +15,7 @@ from __future__ import annotations
import struct
from enum import IntEnum, IntFlag
from math import ceil, log
from typing import IO, NamedTuple
from typing import IO, NamedTuple, cast
from . import Image, ImageFile
@ -294,6 +294,7 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
flags = CompiledVtfFlags(0)
if pixel_format in (
VtfPF.DXT1,
VtfPF.DXT3,
VtfPF.DXT5,
VtfPF.RGBA8888,
@ -360,9 +361,11 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
min_size = 4 if pixel_format in BLOCK_COMPRESSED else 1
for mip_id in range(mipmap_count - 1, 0, -1):
mip_width = max(min_size, width >> mip_id)
mip_height = max(min_size, height >> mip_id)
mip = im.resize((mip_width, mip_height))
size = cast(
tuple[int, int],
tuple(max(min_size, dimension >> mip_id) for dimension in im.size),
)
mip = im.resize(size)
_write_image(fp, mip, pixel_format)
_write_image(fp, im, pixel_format)